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