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