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