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