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