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