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