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