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