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