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