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