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