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