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