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