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)(15,23)(16,26)(17,21)(18,24)(19,20)(22,28)(25,27)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,19)(16,24)(17,20)(18,25)(21,23)(22,27)(26,28) involution — undirected(2,4)(6,9)(10,11)(13,16,18,19,17,27,28,23)(14,20,22,26,21,15,24,25)(5,7,8,12)(6,10,9,11)(14,21)(15,20)(22,24)(25,26)(2,4)(15,20)(16,27)(19,23)(25,26) 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.