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