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