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