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