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