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