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)(33,34,37,42)(35,44,45,39)(36,41,49,58)(38,40,51,43)(46,56,48,53)(47,52,59,54)(50,55,62,57)(60,63,61,64)(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)(34,39)(36,48)(37,45)(38,47)(40,54)(41,56)(42,44)(43,52)(46,49)(50,61)(51,59)(53,58)(55,63)(57,64)(60,62)(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)(35,45)(36,49)(38,51)(39,52)(41,57)(42,43)(44,54)(53,64)(55,58)(56,63)(60,61)(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)(35,46)(37,49)(38,50)(39,53)(40,55)(42,58)(43,57)(44,56)(45,48)(47,60)(51,62)(52,63)(54,64)(59,61)(2,10)(7,11)(8,9)(15,16)(17,20,21,27)(18,23,24,30)(19,26,25,31)(22,29,28,32)(34,42)(35,45)(36,49)(40,43)(47,59)(50,62)(53,56)(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.