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