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