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