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