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