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