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