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