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