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