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