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