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