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