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