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