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