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)(11,14)(12,16)(13,15)(17,18,23,21,22,25,32,31)(19,24,27,26,20,28,30,29)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(17,19,22,20)(18,24,25,28)(21,26,31,29)(23,27,32,30)(9,12,13,11)(10,14,15,16)(17,20,22,19)(18,24,25,28)(21,26,31,29)(23,30,32,27)(3,8)(5,7)(19,20)(24,28)(26,29)(27,30) involution — undirected(2,6)(5,7)(17,21,23,25,22,31,32,18)(19,26,27,28,20,29,30,24)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.