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