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