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