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