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