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