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)(19,22)(20,23)(21,25)(24,29)(26,31)(27,30)(28,32) involution — undirected(1,3,5,11)(2,6,7,15)(4,13,14,10)(8,16,12,9)(17,19)(18,22)(20,28)(21,26)(23,30)(24,32)(25,31)(27,29)(18,23,25,24)(22,30,31,32)(2,7)(6,15)(8,12)(9,16)(19,26)(22,31)(27,28)(30,32) 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.