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