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