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