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