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