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