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