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