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