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