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Originally Posted by Duke461
Except for the fact the file is all one part......
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In SolidWorks (can't say about Pro/E, Inventor, and others, but I imagine it's also the case there) you can change appearance of individual bodies and faces. Right click them and click the Appearance icon (a colored sphere). Not ideal, but you can get color discrimination within a single part that way.
Edit: Also, With a the appropriate render of just the gray CAD you could just use photoshop or gimp or similar to add the colors. It could be tricky to get the anti-aliasing just right.