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