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