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