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)(13,14,18,19)(15,23,25,20)(16,21,26,28)(17,22,24,27)(5,7,9,8)(6,10,11,12)(14,19)(15,20)(16,26)(17,22)(23,25)(24,27)(1,2,3,4)(13,15,18,25)(14,20,19,23)(16,27,26,22)(17,21,24,28)(5,8,9,7)(6,10,11,12)(13,16,18,26)(14,21,19,28)(15,24,25,17)(20,22,23,27)(13,17,18,24)(14,22,19,27)(15,21,25,28)(16,23,26,20)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.