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