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