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