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