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