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