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