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