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