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