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