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