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