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