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