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