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