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