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