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