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