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