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