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