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