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