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