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