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