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