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