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