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