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