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