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