I think you can change the display of sheet metal in the options menu.

It does seem like this doesn't work exactly like I thought though. When I set the setting to white, the driving surface of my sheet metal part displays with white edges. The other edges don't though.

I thought that this might be related to the default appearance of my start part being green. I changed that next. I also added a few flanges to see what happens. This is the result:

Here's the drawing display as well:

I think this might be what you want but you'll have to play with it yourself.