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