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