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