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