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