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