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