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