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