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