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