One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,14)(10,13)(11,15)(12,16)(17,18)(19,27)(20,21)(22,26)(23,25)(24,29)(28,30)(31,32) involution — undirected(1,3)(2,6)(4,9)(5,10)(7,14)(8,13)(11,16)(12,15)(17,19,23,31)(18,24,25,28)(20,27,26,32)(21,30,22,29)(1,4)(2,7)(3,9)(5,11)(6,12)(8,15)(10,16)(13,14)(17,20,21,18,23,26,22,25)(19,28,29,32,31,24,30,27)(4,11)(7,15)(9,16)(12,14)(18,25)(20,26)(24,28)(27,32) 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.