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