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