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