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