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