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