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)(16,21)(17,27)(18,22)(19,25)(23,28)(24,26)(5,6)(7,11)(8,10)(9,12)(13,15,18,24)(14,19,22,16)(17,21,28,25)(20,23,26,27)(2,4)(5,7,8,12)(6,9,10,11)(13,15)(14,20)(16,23)(17,25)(18,24)(19,27)(21,28)(22,26)(7,12)(9,11)(13,16,18,19)(14,21,22,25)(15,23,24,27)(17,20,28,26)(6,10)(9,11)(14,22)(15,24)(21,25)(23,27) 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.