Put together a regular schedule. If a Holiday falls on a day you would usually work, then you get that day as holiday. If it falls on a day when you wouldn't usually be there then no holiday for you. Don't pick Monday as your day off or you'll never get a holiday.
Alternately, figure out how many hours of holiday leave your coworkers get. Multiply it by 30/32.5 (92%). Figure out which 8% of the Holidays (probably less than 1 day) you will either make up or take unpaid.