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