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