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