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