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