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