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