Hi.. I am not a college graduate too but been practicing Admin / HR for 20++ yrs now.
I can relate to your concern, however as HR, its is really the discretion of the company who to retain as regular employees. We have SOP's but the Management can very well make exception to any rule as long as they don't violate any law. For your issue, I can't see any labor violation.
If the company you applied require all their regular employees MUST BE college graduate, its their right to do that. But if the management find an applicant / employee to be exceptional and can very well perform the job very well, then its a matter of they like you or not... that's it.. again, they can always make exception to the rules,, its their rule, the Management can break it.
Just find a company that can recognize your abilities, I did.. you will grow more to employers who will value your contributions to the company.. Good luck..