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