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