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