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)(17,18,21,23,22,26,20,25)(19,27,28,24,30,31,29,32)(1,3,9,11,5,10,4,12)(2,6,8,16,7,14,15,13)(18,23)(20,21)(24,27)(25,26)(28,29)(31,32)(17,19)(18,24)(20,28)(21,29)(22,30)(23,27)(25,31)(26,32) involution — undirected(2,7)(3,10)(8,15)(11,12)(17,20,22,21)(18,23,26,25)(19,28,30,29)(24,27,32,31)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.