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