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