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