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