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