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