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