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