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