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