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