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