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