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