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