I'm pretty sure a buzz cut would emphasize the grey - it sure seems to on everyone I've seen with one, male and female. Can you color your hair effectively without also visibly coloring your scalp?

It's just another hairstyle that conveys a certain look, no different in that way from any other hairstyle. I have zero interest in styles that need a lot of maintenance, which is one reason a buzz cut appeals to me more than shaving - I would think I could go several days and maybe up to a week between cuts. I've had my hair the same style for over 20 years now and I'm playing with the idea of changing my look. No different from why someone else might grow her hair out, or get a perm or color.