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