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