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