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