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