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