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)(20,21)(22,25)(23,26)(24,30)(28,29)(31,32) involution — undirected(1,3,4,8)(2,5,6,7)(9,10)(11,13)(12,14)(15,16)(17,18,20,25,23,26,22,21)(19,27,31,29,30,24,28,32)(2,6)(3,8)(9,11,12,15)(10,13,14,16)(17,19,23,30)(18,24,26,27)(20,31,22,28)(21,29,25,32)(2,6)(5,7)(10,14)(13,16)(17,20,23,22)(18,25,26,21)(19,28,30,31)(24,29,27,32)(2,6)(5,7)(17,21,20,18,23,25,22,26)(19,29,31,24,30,32,28,27)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.