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