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