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