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