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