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