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