One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,13)(4,18)(5,23)(6,28)(7,11)(8,15)(9,21)(10,26)(12,25)(14,42)(16,41)(17,47)(19,50)(20,52)(22,35)(24,39)(27,57)(29,37)(30,60)(31,46)(32,58)(33,43)(34,56)(36,54)(38,59)(40,44)(45,63)(48,51)(49,55)(53,61)(62,64) involution — undirected(1,3)(2,8)(4,19)(5,24)(6,29)(7,16)(9,33)(10,37)(11,31)(12,39)(13,23)(14,21)(15,26)(17,25)(18,48)(20,53)(22,44)(27,58)(28,32)(30,35)(34,40)(36,61)(38,47)(41,57)(42,49)(43,56)(45,54)(46,59)(50,52)(51,55)(60,64)(62,63) involution — undirected(1,4,5,20,25,54,59,64,7,22,27,56,6,21,26,55)(2,9,10,34,28,35,57,62,11,36,38,52,12,18,23,49)(3,14,15,43,29,44,58,60,16,45,46,53,17,19,24,51)(8,30,13,40,39,33,47,42,31,48,41,50,32,61,37,63)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.