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