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