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)(13,14,17,23,18,22,28,21)(15,24,16,20,26,19,25,27)(2,3)(5,6)(7,11)(8,10)(9,12)(13,15)(14,19)(16,17)(18,26)(20,21)(22,24)(23,27)(25,28) involution — undirected(5,7)(6,9)(8,12)(10,11)(13,14)(15,24)(16,27)(17,21)(18,22)(19,26)(20,25)(23,28) involution — undirected(1,3,4,2)(7,12)(9,11)(13,16,18,25)(14,20,22,27)(15,17,26,28)(19,21,24,23)(6,10)(9,11)(13,17,18,28)(14,21,22,23)(15,25,26,16)(19,27,24,20)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.