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