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