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