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