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