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