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)(16,23,25,28)(20,24,27,26)(1,2)(3,4)(6,9)(10,12)(13,15,18,14,19,21,17,22)(16,23,24,20,25,28,26,27)(2,4)(5,7,8,11)(6,10,9,12)(13,16,18,24,19,25,17,26)(14,20,21,28,22,27,15,23)(1,2)(3,4)(13,17,19,18)(14,21,22,15)(16,24,25,26)(20,23,27,28)(2,4)(16,25)(20,27)(23,28)(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.