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