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