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