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