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