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)(15,16)(17,18)(19,20)(21,22,26,28)(23,24,25,27)(6,11)(9,12)(14,18)(15,20)(21,23,26,25)(22,24,28,27)(5,7,10,8)(6,9,11,12)(13,15)(14,19)(16,18)(17,20)(21,24,26,27)(22,23,28,25)(1,2)(3,4)(5,8,10,7)(6,9,11,12)(13,16,17,19)(14,15,18,20)(21,22)(23,24)(25,27)(26,28)(5,9)(6,8)(7,11)(10,12)(13,15)(14,16)(17,20)(18,19)(21,25,26,23)(22,27,28,24)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.