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