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