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