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