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