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