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)(11,13)(12,14)(15,16)(18,23)(19,27)(20,22)(24,31)(28,32)(29,30) involution — undirected(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,18)(19,28)(20,25)(21,23)(22,26)(24,29)(27,31)(30,32) involution — undirected(11,15)(13,16)(17,19)(18,24)(20,27)(21,29)(22,30)(23,28)(25,32)(26,31) involution — undirected(10,14)(13,16)(17,20,21,22)(18,25,23,26)(19,27,29,30)(24,32,28,31)(1,3,4,7)(2,6,5,8)(18,23)(24,28)(25,26)(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.