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