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)(11,13)(12,14)(15,16)(18,23)(21,24)(25,30)(26,31)(27,29)(28,32) involution — undirected(9,11)(10,13)(12,15)(14,16)(17,18,24,31,22,26,21,23)(19,25,29,32,20,28,27,30)(2,5)(6,8)(11,15)(13,16)(17,19)(18,25)(20,22)(21,27)(23,30)(24,29)(26,28)(31,32) involution — undirected(11,15)(13,16)(17,20,22,19)(18,25,26,28)(21,29,24,27)(23,30,31,32)(1,3,4,7)(2,6,5,8)(10,14)(13,16)(19,20)(25,28)(27,29)(30,32)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.