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