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