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