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