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