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