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