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