Should I pay off my loan now or when I graduate and does that affect my financial aid?

If your loan was a subsidized loan, then interest does not accrue until six months after you graduate. So, if you paid it off now or waited until 4 or 5 months after you graduate, the amount you would pay is the same. But, the money you have saved through working could be earning interest in the time between now and when you graduate. So, I would keep the money you have saved in something that earns you interest and wait until you are in the grace period to repay the loan.