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