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