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