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)(18,23)(20,21)(24,31)(25,26)(27,32)(28,30)(1,3)(2,6)(4,12)(5,10)(7,9)(8,16)(11,13)(14,15)(17,18)(19,27)(20,26)(21,23)(22,25)(24,28)(29,31)(30,32) involution — undirected(2,7)(4,13)(11,12)(14,16)(17,19)(18,24)(20,28)(21,30)(22,29)(23,27)(25,32)(26,31) 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.