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