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