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