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