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