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