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