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