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