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