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