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)(11,13)(12,14)(15,16)(17,18)(19,23)(20,22)(21,25)(24,28)(26,30)(27,29)(31,32) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(19,26)(23,30)(27,32)(29,31) involution — undirected(11,15)(13,16)(18,22)(20,28)(23,29)(24,25)(27,32)(30,31) involution — undirected(10,14)(13,16)(17,19,21,26)(18,23,25,30)(20,27,28,32)(22,29,24,31)(1,3,4,7)(2,6,5,8)(19,26)(23,30)(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.