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