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