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)(15,18)(16,19)(17,20)(21,22,27,25)(23,28,26,24)(5,6,8,9)(7,11,12,10)(13,15)(14,17)(16,20)(18,19)(21,23,27,26)(22,28,25,24)(6,9)(10,11)(13,15,16,20)(14,18,19,17)(21,24)(22,26)(23,25)(27,28)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15)(14,18)(16,20)(17,19)(21,25,27,22)(23,28,26,24)(5,7,8,12)(6,10,9,11)(13,14)(15,18)(16,19)(17,20)(21,26,27,23)(22,28,25,24)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.