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