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