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