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