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