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