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