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