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