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