According to facebook help center you can't.
According to the same question on facebook discussions center :
Quote:
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You can only do this by deleting the group and recreating it with a new name. If you have a lot of members create the new group and place a note in the old group asking them to join the new one. Then after they move over delete the old group.
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Last edited by pc; 2010-06-14 at 11:00 PM..
Reason: i'm not a facebook guru
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