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