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