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