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