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