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