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