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