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)(13,14,17,19)(15,16,20,18)(5,6,8,10)(7,9,12,11)(13,15)(14,18)(16,19)(17,20)(21,22,24,26)(23,27,28,25)(5,6)(7,9)(8,10)(11,12)(13,16,17,18)(14,15,19,20)(21,23,24,28)(22,25,26,27)(1,2,3,4)(5,6)(7,9)(8,10)(11,12)(13,16)(14,15)(17,18)(19,20)(5,7,8,12)(6,9,10,11)(13,14)(15,16)(17,19)(18,20)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.