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