Microdermabrasion should not lead to any issues in a diabetic. You should be under good control however just to decrease any reaction or possible infection with the microdermabrasion. Even if you sugars were not under total control the chance of something happening with superficial microdermabrasion is extremely small. Microdermbrasion is a very superficial skin facial treatment and should not affect the skin's water tight barrier to a great degree.
So introduction of foreign material, bacteria past the defences is much less likely with microdermabrasion as opposed to deeper chemical peels, laser resurfacing and dermabrasion. Even with these deeper treatments, you can get them if you are a diabetic. One thing to make sure is to have your sugars under control. If this is not your current state, infections can be more risky for a diabetic with poor sugar control.