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