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