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