First, I'll explain one of the other hints.
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×Giant golems are four squares big. They can't fit through an opening one square big. You can leave these openings, kill the giants, and lure the smaller golems out through the openings later.
There's really no right or wrong way to do the room, but here are some things that worked for me:
To start with...
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×head for a tunnel and kill golems on all sides of you. Wait there and draw the giant golems toward you, then escape through on of the other tunnels.
Also...
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×like small golems, working diagonally is your best bet. I started out working in a spiral shape.