I have a 3 year old that does that.
I began with counting to 3 out loud then physically taking her hand and leading her to the quiet spot. I told her she could return to the group when she felt she could follow the rules. (*standard redirect*)
Eventually she would go to the quiet spot or begin to follow the rules upon the count of one.
It is sort of endearing that I can walk to the center of the room and calmly say "one" and every eye in the room will look to me for further instructon, then check their neighbor for infractions.
Obviously I don't do it often or it would become ineffective.