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)(19,24)(20,30)(21,23)(22,26)(25,32)(27,40)(28,44)(29,36)(31,41)(33,42)(34,37)(35,38)(39,45)(43,47)(46,48) involution — undirected(1,3,4,8)(2,5,6,7)(18,23)(19,27)(20,31)(22,34)(24,38)(25,41)(28,45)(29,35)(30,42)(32,33)(36,40)(47,48)(10,13)(14,16)(17,19,21,29)(18,24,23,36)(20,28,32,45)(22,35,34,27)(25,39,30,44)(26,38,37,40)(31,46,33,43)(41,48,42,47)(2,6)(5,7)(9,11,12,15)(10,14,13,16)(18,23)(20,32)(24,36)(26,37)(28,45)(31,33)(38,40)(43,46)(3,8)(5,7)(17,20,21,32)(18,25,23,30)(19,28,29,45)(22,31,34,33)(24,39,36,44)(26,42,37,41)(27,43,35,46)(38,47,40,48)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.