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