One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,5)(4,7)(6,8)(9,10)(11,16)(12,14)(13,15)(17,18)(19,27)(20,28)(21,32)(22,26)(23,31)(24,29)(25,30) involution — undirected(1,3,5,2)(4,7,8,6)(11,12)(14,16)(17,19)(18,24)(20,25)(21,28)(22,29)(23,30)(26,27)(31,32)(2,3)(6,7)(9,11,13,12)(10,14,15,16)(17,20,28,18,22,31,23,26)(19,25,21,24,29,32,30,27)(1,4,5,8)(2,6,3,7)(17,21,22,30)(18,25,26,32)(19,28,29,23)(20,27,31,24)(9,12,13,11)(10,14,15,16)(19,29)(21,30)(24,27)(25,32)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.