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