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