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