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