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