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