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