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