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