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