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