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