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