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