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