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