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