It is an image. To color in Illustrator you need to trace it, but you will lose some detail.
To color it in Photoshop:
In Photoshop, open the page as image.
To get rid of the white:
Unlock the background layer.
Create a new transparent layer below it.
Select the car layer.
From the Layers panel choose Blending Options…
Move the right slider of This Layer a little to the left (254 or 253).

Click OK.
Choose Merge Down
Set the Car layer to Multiply.
Create a layer below it to add the color (and maybe another layer below that filled with white).