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