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