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