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