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