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