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