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