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