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)(11,13)(12,14)(15,16)(17,18)(19,24)(20,21)(22,31)(23,25)(26,28)(27,30)(29,32) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,24)(20,30)(21,27)(22,28)(23,29)(25,32)(26,31) involution — undirected(10,14)(11,15)(17,20,21,18,23,31,22,25)(19,26,27,32,29,30,28,24)(11,15)(13,16)(17,21,23,22)(18,20,25,31)(19,27,29,28)(24,30,32,26)(1,3,4,7)(2,6,5,8)(17,21,23,22)(18,20,25,31)(19,28,29,27)(24,26,32,30)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.