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