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