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