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