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