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