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