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