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