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