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