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