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