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