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