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)(19,24)(20,31)(23,28)(29,30) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18,22,26)(19,28,24,23)(20,29,31,30)(21,25,32,27)(10,14)(11,15)(17,19)(18,23)(20,27)(21,30)(22,24)(25,31)(26,28)(29,32) involution — undirected(1,3,4,7)(2,6,5,8)(10,14)(13,16)(17,20,32,23,22,31,21,28)(18,24,25,30,26,19,27,29)(2,5)(6,8)(17,21,22,32)(18,25,26,27)(19,29,24,30)(20,28,31,23)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.