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