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