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