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