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