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