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