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