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