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