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