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