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