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