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