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