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