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