Radio buttons imply that only one value from the set can be selected. You can "break" that convention in FileMaker by holding down the shift key and a script can assign multiple values separated by returns to a field to select multiple radio buttons, but if you are going to permit selecting multiple values, I recommend using the check box format.
Is there a way that if I check boxes for the selection those boxes that are check show in a different color?
Sort of. You can do this by simulating a list of check box values but where you are actually clicking buttons instead of check boxes that are formatted and scripted to look and act like actual check boxes.