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