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