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