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