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