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