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