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