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