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