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