You could decrease each toe proportionalely by 1/7 (the decrease from 56 to 48 sts). That would mean working with 1 or 2 fewer sts on each toe.
The pattern actually goes down to 66sts after the toes and then decreases to 56sts. You could pick up about 57sts from the toes and then decrease to 48sts. It may take some playing around to get the fit that you want.