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