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