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