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