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