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