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