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