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