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