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