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