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