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