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