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