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