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