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