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