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