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