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