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