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