how can we split text from suggested color to individual text frame?

This should split a text frame at the beginning of a paragraph, if the color of the first character of the paragraph is the same as the first character of the first paragraph. Not extensively tested.

// select 1 textFrame
var doc = app.activeDocument;
var sel = doc.selection[0];
var targetColor = sel.paragraphs[0].characters[0].fillColor;
var textFont = sel.textRange.textFont;
var size = sel.textRange.size;
var justification = sel.textRange.justification;

// divide text
var quotients = [];
var lines = 0, contents = "", colors = [];
for (var i = sel.paragraphs.length - 1; i > -1; i--) {
    try {
        lines = sel.paragraphs[i].lines.length + lines;
        if (sel.paragraphs[i].contents == "") continue;
        contents = sel.paragraphs[i].contents + "\n" + contents;
        subcolors = [];
        for (var j = 0; j < sel.paragraphs[i].characters.length; j++) {
            subcolors.push(sel.paragraphs[i].characters[j].fillColor);
        }
        subcolors.push(undefined);  // color corresponding to linebreak
                                    // null crashes Illustrator
        colors = subcolors.concat(colors);
        if (areEqual(sel.paragraphs[i].characters[0].fillColor, targetColor)) {
            var quotient = {};
            quotient.lines = lines;
            quotient.contents = contents;
            quotient.colors = colors;
            quotients.push(quotient);
            lines = 0, contents = "", colors = [];
        }
    } catch (e) {
    }
}

// re-draw textFrames
var precedingHeight = sel.geometricBounds[1];
for (var i = quotients.length - 1; i > -1; i--) {
    var lines = quotients[i].lines;
    var height = lines * sel.textRange.characterAttributes.leading;
    var rect = doc.pathItems.rectangle(
        precedingHeight, sel.geometricBounds[0], sel.width, height);
    precedingHeight -= height;
    var textFrame = doc.textFrames.areaText(rect);
    textFrame.contents = quotients[i].contents;
    textFrame.textRange.textFont = textFont;
    textFrame.textRange.size = size;
    textFrame.textRange.justification = justification;
    for (var j = 0; j < textFrame.characters.length; j++) {
        if (quotients[i].colors[j] == undefined) continue;
        else textFrame.characters[j].fillColor = quotients[i].colors[j];
    }
}

sel.remove();

function areEqual(o1, o2) {
    for (var k in o1) {
        if (o1[k] != o2[k]) return false;
    }
    for (var k in o2) {
        if (o1[k] != o2[k]) return false;
    }
    return true;
}