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