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