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