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