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