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