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