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