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