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