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