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