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