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