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