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