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