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