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