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