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