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