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