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