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