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