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