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