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