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