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