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