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)(17,18,22,27)(19,23,29,32)(20,26,21,25)(24,30,31,28)(1,3,5,4)(2,7,8,6)(10,13)(14,15)(17,19)(18,23)(20,30)(21,28)(22,29)(24,25)(26,31)(27,32)(1,3,5,4)(2,7,8,6)(9,11,12,16)(10,14,13,15)(17,19)(18,24)(20,28)(21,30)(22,29)(23,25)(26,32)(27,31)(1,4,5,3)(2,7,8,6)(17,20,22,21)(18,25,27,26)(19,28,29,30)(23,31,32,24)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.