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