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