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