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