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)(20,25)(21,26)(22,37)(23,27)(24,31)(29,45)(30,40)(32,48)(33,42)(34,43)(35,39)(36,44)(38,47)(41,46)(9,10)(11,14)(12,13)(15,16)(17,19,21,35,23,30,22,31)(18,24,37,40,27,39,26,28)(20,32,36,47,33,29,34,46)(25,41,43,45,42,38,44,48)(2,5)(6,8)(10,13)(14,16)(17,20,23,33)(18,25,27,42)(19,29,30,32)(21,36,22,34)(24,38,39,41)(26,44,37,43)(28,45,40,48)(31,47,35,46)(1,3,4,7)(2,6,5,8)(9,11)(10,14)(12,15)(13,16)(19,30)(20,33)(24,39)(25,42)(28,40)(31,35)(34,36)(43,44)(11,15)(14,16)(17,21,23,22)(18,26,27,37)(19,31,30,35)(20,34,33,36)(24,40,39,28)(25,43,42,44)(29,46,32,47)(38,45,41,48)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.