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