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