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