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