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