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