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