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)(11,15)(12,16)(17,18)(19,27)(20,25)(21,24)(22,26)(23,29)(28,32)(30,31) involution — undirected(7,15)(10,16)(17,19,22,30)(18,23,26,32)(20,28,21,29)(24,31,25,27)(1,3)(2,7)(4,13)(5,11)(6,12)(8,16)(9,15)(10,14)(18,24)(19,28)(20,21)(25,26)(27,31)(29,30) involution — undirected(1,4,6,5)(2,8,9,14)(3,11,12,13)(7,10,15,16)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.