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