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