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