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)(2,5)(4,8)(6,7)(17,18,23,26)(19,27,30,31)(20,25,22,32)(21,29,24,28)(10,13)(14,16)(17,19,23,30)(18,24,26,21)(20,29,22,28)(25,31,32,27)(2,6)(5,7)(9,11,12,15)(10,14,13,16)(17,20,23,22)(18,25,26,32)(19,28,30,29)(21,31,24,27)(3,8)(5,7)(17,21,23,24)(18,19,26,30)(20,31,22,27)(25,28,32,29)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.