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