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