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