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