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