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