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