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