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