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