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