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