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