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