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