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