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