Best bet is to buy it in the colour you want, quite a wide range of colours available & some suppliers will sell small pieces. Alternatively you can cover it with self adhesive vinyl, just watch out for dust as acrylic generates quite a bit of static.
Direct printing is an option but not very hard wearing as it scratches off very easily plus if you don't have the correct gear to do it then getting someone to do it for you probably won't be cheap.