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