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