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