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