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