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