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