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