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