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