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