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)(19,23,29,38)(20,30,33,24)(21,25,34,41)(27,36,35,42)(28,44,45,37)(31,40,32,39)(43,48,46,47)(2,6)(7,8)(9,11,12,15)(10,13,14,16)(19,27)(20,31)(21,34)(23,36)(24,39)(25,41)(29,35)(30,40)(32,33)(38,42)(43,46)(47,48)(1,3,5,4)(2,7,6,8)(10,14)(13,16)(17,19,22,29)(18,23,26,38)(20,28,33,45)(21,35,34,27)(24,37,30,44)(25,42,41,36)(31,43,32,46)(39,47,40,48)(1,4,5,3)(2,8,6,7)(19,27)(20,32)(21,34)(23,36)(24,40)(25,41)(28,45)(29,35)(30,39)(31,33)(37,44)(38,42)(17,20,22,33)(18,24,26,30)(19,28,29,45)(21,32,34,31)(23,37,38,44)(25,40,41,39)(27,43,35,46)(36,47,42,48)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.