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)(21,22,25,26)(23,24,27,28)(2,4)(6,10)(8,11)(13,14,16,17)(15,20,19,18)(21,22)(23,24)(25,26)(27,28)(1,2,3,4)(6,10)(8,11)(14,17)(18,20)(22,26)(24,28)(5,7,9,12)(6,8,10,11)(13,15)(14,18)(16,19)(17,20)(21,23)(22,24)(25,27)(26,28)(5,8)(6,7)(9,11)(10,12)(13,14)(15,20)(16,17)(18,19)(21,24)(22,27)(23,26)(25,28) 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.