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