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