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