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