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