One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,12)(4,17)(5,20)(6,19)(7,11)(8,15)(9,21)(10,22)(13,14)(16,27)(18,32)(23,28)(24,29)(25,30)(26,31)(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)(1,3,6,15,7,16,22,30)(2,8,10,12,11,25,19,27)(4,18,20,26,21,13,28,29)(5,14,17,31,23,32,9,24)(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)(1,4)(2,9)(3,13,16,18)(5,10)(6,20)(7,21)(8,24,25,31)(11,17)(12,14,27,32)(15,29,30,26)(19,23)(22,28)(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)(1,5,22,9,7,23,6,17)(2,4,19,28,11,21,10,20)(3,14,30,24,16,32,15,31)(8,18,27,29,25,13,12,26)(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.