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