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