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)(14,15)(17,18)(19,23)(20,22)(21,24)(27,28)(30,31) involution — undirected(1,2,4,6)(3,7,8,5)(9,10)(11,15)(12,13)(14,16)(17,19,22,21)(18,23,20,24)(25,26,29,32)(27,30,28,31)(3,8)(5,7)(10,12)(14,15)(17,18,22,20)(19,24,21,23)(25,27,29,28)(26,30,32,31)(1,2)(3,7)(4,6)(5,8)(9,11,13,16)(10,14,12,15)(17,20,22,18)(19,23,21,24)(25,26)(27,30)(28,31)(29,32)(1,3,4,8)(2,5,6,7)(9,12,13,10)(11,14,16,15)(17,21,22,19)(18,23,20,24)(25,28,29,27)(26,31,32,30)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.