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