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