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