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