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