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