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