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