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