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