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