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