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