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