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