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