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