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)(11,14)(12,13)(15,16) involution — undirected(2,6)(7,8)(17,18,22,20)(19,26,27,32)(21,24,31,25)(23,30,29,28)(1,3,5,4)(2,7,6,8)(10,13)(14,16)(17,19,22,27)(18,23,20,29)(21,30,31,28)(24,26,25,32)(9,11,12,15)(10,14,13,16)(17,20,22,18)(19,26,27,32)(21,25,31,24)(23,30,29,28)(1,4,5,3)(2,8,6,7)(18,24)(19,27)(20,25)(21,31)(23,32)(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.