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