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