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