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