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