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