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