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