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