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