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