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