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