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