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