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