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