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