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