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