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