One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,13)(4,9)(5,10)(6,11)(7,12)(8,15)(14,29)(16,24)(17,23)(18,22)(19,26)(20,28)(21,27)(25,30)(31,32)(33,34)(35,45)(36,49)(37,43)(38,42)(39,44)(40,48)(41,51)(46,54)(47,59)(50,58)(52,57)(53,55)(56,61)(60,62)(63,64) involution — undirected(1,3,7,17)(2,8,12,24)(4,18,20,31)(5,16,6,15)(9,25,28,29)(10,13,11,23)(14,21,30,19)(22,27,32,26)(33,35,39,47)(34,40,44,55)(36,46,52,61)(37,53,38,48)(41,56,58,54)(42,59,43,45)(49,60,57,64)(50,63,51,62)(1,4,7,20)(2,9,12,28)(3,14,17,30)(5,19,6,21)(8,22,24,32)(10,26,11,27)(13,29,23,25)(15,18,16,31)(33,36,39,52)(34,41,44,58)(35,46,47,61)(37,51,38,50)(40,54,55,56)(42,49,43,57)(45,60,59,64)(48,63,53,62)(1,5,7,6)(2,10,12,11)(3,15,17,16)(4,19,20,21)(8,23,24,13)(9,26,28,27)(14,18,30,31)(22,25,32,29)(35,47)(40,55)(45,59)(46,61)(48,53)(54,56)(60,64)(62,63)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.