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