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