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