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