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