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