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