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