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