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