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