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