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