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