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