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