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