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