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