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