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