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