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