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