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