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