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