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