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