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