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