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