That's an interest of mine and from what I've learned, the key is simply to eat less. You can't grow if you don't eat enough, but you can still get stronger. Also from what I've read guys who are interested in strength without gaining size would work with lower rep ranges and less volume.
I'm really into that sort of thing because I want to stay at a certain weight, and also being stronger than I look appeals to me for some reason. The power/weight ratio of athletes who have weight classes like Powerlifters and Olympic lifters is just amazing. I learned a lot from Ross Enamait's books. That guy is awesome, I don't think he weighs more than 160 lbs but he does some crazy ****, like standing ab wheel rollouts with an 80 lb weight vest, 1 arm pull ups, etc.
I never go over 6 reps on an exercise, usually stay between 3-5 reps, and I don't try to eat a lot like most of the guys on here, I just eat whenever I get hungry but I still follow a lot of the same principles (high protein, lots of good fats, carbs around workouts only, carb cut off at night, etc.)